Thomas j



'T. J. MURPHY.

TELEGRAPH SOUNDER. APPLICATION man Mom-e0. um.

Patented May 20, 1919.

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THOMAS J'. MURPHY, OF ROCHESTER, NEW YORK, ASSIGNOR 0F ONE-HALF TO JAMES P. B. DUFFY, OF ROCHESTER, NEW YORK.

TELEGRAPH-SOUNDER.

Specification of Letters Patent.

Patented May 20, 1919.

Application filed November 30, 1917. Serial Ito 204,652.

To all whom it may concern:

Be it known that I, THOMAS J. MUnrrrY, a

subject of the King of Great Britain, and

a resident of Rochester, in the county of Monroe, in the State of New York, have invented a certain new and useful Telegraph- Sounder; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention relates to. telegraph sounders to be used in connection with an alternating current. It has for its object to provide a means which yieldingly holds the sounding memberwhen it has produced its sound and thereby prevents chattering, and it also has for its object to so construct the yielding holding means that when the member is moved to one yieldingly retained position it will produce a sound different from that produced when moved to its other yieldingly retained position. It also has for its object to provide a means for preventing .any rattling or chattering that may be due to looseness of the means for pivotally supporting the sounding member. Other features of the invention will appear from the description and the drawings.

The invention may be contained in electrical constructions of different forms. I have selected a telegraph sounder as an illustration of constructions containing the invention and shall describe it hereinafter. The construction selected is illustrated in the accompanying drawings.

Figure 1 of the drawings is a side view of a sounder containing my invention. Fig. 2 is a bottom view of the supporting base. Fig. 3 is a sectional view taken on the line 3-3 indicated in Fig. 1.

1', Figs. 1 and 2, is the supporting base for the sounder. It is provided with supporting feet or pegs 2, located in the corners of the base. A resonant plate 3 formed of any suitable material, such as wood or metal, is supported at three points upon the base 1. The plate 3 is supported by screws 4 that pass through the base 1 and are threaded into the plate 3. Sleeves or bushings 5 are located intermediate the plate 3 and the base 1 and surround the screws 4 to rigidly hold the plate 3 at a point slightly remote from the base 1. Two of the screws 4: and the sleeves 5 are located at one end of the plate 3 and butone of the screws 4: together with its coacting sleeve 5 is located at the other end of the plate 3. To the plate 3 are secured posts 6. The posts 6 are located at the ends of the plates 3 and transmit from the sounding member 7, the sound produced thereby to the plate 3. The plate 3 being supported at two points at one end and'at one point at the other end, the plate 3 causes the emission of sounds of different intensities or tones when the sounding member completes its to and fro movement.

The sounding member 7 is caused to move by the current that is passed through the coils 8 and 9. The coils 8 and 9 surround the end legs of an E-core. The coils 8 and 9 are connected with a source of alternating current and with a key, through the three lines 10, 11 and 12, the line 11 being a common return between the lines 10 and 12. The coil 8 is located intermediate the lines 10 and 11 and the coil 9 is connected in the lines 11 and 12. The telegraph key is connected so as to direct the current first through the lines 10 and 11 and the coil 8 and then through the lines 11 and 12 and the coil 9. The current being alternating in character the core 13 is preferably laminated to reduce the eddy currents that would be formed in the core. 7 which is the armature operated by the energizing of the coils 8 and 9 is supported on the middle leg of the core so that the magnetic circuit extends through the mid dle leg and alternately through the end legs of the core, the coils 8 and 9 being located around the end legs of the coil. This magnetizes and draws down the armature 7 first toward the coil 8 and then toward the coil 9. The magnetic circuit being completed through the armature on one or the other side of its pivot point as the coil 8 or 9 is energized.

The sound is produced by the sounding member 7 striking anvil 14 and 15 that are supported in L-members 16. The L-members 16 are secured to the posts 6 by means of the screws 17 The anvil 14 is threaded into an L-member and is locked in its adjusted position by a suitable thumb'nut 18. A pair of felt washers 19 are secured in position around the pin by means of a nut and a metal washer 21 that holds the pin 15 centrally with respect to an opening formed in one of the L-members 1?. through which the pin 15 extends. By this arrangement the sound produced by the sounding member or armature 7 when it strikes the anvil 14 is louder and more distinct than when the sounding member 7 strikes the anvil 15. The sound thus transmitted to and emitted from the plate 3 at one of its ends is different from the sound transmitted to and emitted from the other end of the plate 3.

A permanent magnet is secured to the L-members 16 by means of screws 23. The L-members l6 and the pins l-l and 15 beingparamagnetic will. extend the magnetic field induced, by the permanent magnet 22 through the Lmembers 16 and the anvils 14 and 15 to the armature 7 which is also paramagnetic. By this arrangement the armature 7 will be magnetically held when it is brought into contact with either the pin 14. or the pin 15. This will prevent any vibration or chattering so that the sounds produced will be distinct when the armature 7 strikes either the anvils 14 or 15.

To prevent any chattering that might arise by reason of looseness of the bearing support in the armature 7 I have provided a means whereby the parts of the bearing will be held together at all times to prevent any movement of the parts except that of oscillation. The armature 7 is sup-- ported in a U-member 24 that may be secured to the middle leg 25 of the E-core by means of the flanges 26 and the pin 27. Bearings 28-of suitable bearing material, such as steel, are threaded into the U-1nem her 2%. The armature 7 is provided with a pin 29 that extends into the bearings 28. A saddle 30 is located within the U-member 24. The sides of the saddle 30 are provided with openings through which the bearings 28 extend. A spring 31 is secured at a center point to the saddle 30 and extends to Ward the ends of the armature 7. The ends of the spring 31 press against the upper surface of the armature 7 and the center of the spring 31 presses upwardly against the under surface of the saddle 30. The spring 31 thus operates to press the armature 7 downward and so as to press the ends of the bearing pins 29 against the lower sides of the bearings 28. Moreover, the saddle 30 pivots on the outside of the bearings 28 and moves freely with the armature 7, when the armature is actuated by energizing alternately the coils 8 and 9.

Suitable binding posts 32 may be connected to the lines 10, 11 and 12 for con necting the coils 8 and 9 with the source of current supply and the telegraph key.

I claim:

1. In an alternating current telegraph sounder, a permanent magnet, a centrally pivoted sounding member controlled by the permanent magnet, coils at the opposite ends of the pivoted member for operating the pivot. member, an E-core, the coils surrounding the outer legs of the E-core, the pivoted member supported centrally in proximity to the central leg of the E-core.

2. In an alternating current telegraph sounder, a sounding member, coils for operating on opposite ends of the sounding member to move the sounding member in opposite directions, anvils for limiting the movements of the sounding member and producing the sound, a resonant plate, means for connecting the anvils to opposite ends of the resonant plate, means for supporting the ends of the plate at a different number of points whereby the sound emitted to one end of the plate will be diii'erent from th sound from the other end of the plate.

3. In an alternating current telegraph sounder, a pivoted sounding member, magnetic means for moving the sounding memher, a member supported for pivotal movements about the aXis of the movements of the sounding member, a spring located intermediate the second named pivoted member and the sounding member for yieldingly holding the pivot members of the sounding member together.

4. In an alternating current telegraph sounder, an armature pivoted cent-rally, coils located in proximity to opposite ends of the armature for operating the armature, anvils located in proximity to the ends of the armature for limiting the movement of the armature, a felt Washer for supporting one of the anvils to produce a sound different from that of the other anvil when struck by the armature.

In testimony whereof, I have hereunto signed my name to this specification.

THOMAS J. MURPHY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patentn, Washington, D. G." 

